Anthropic has made 1M token context windows generally available for both Opus 4.6 and Sonnet 4.6 models. This is a significant capability expansion for developers building with the Claude API, enabling processing of entire codebases, long documents, or extended conversation histories in a single call. Direct relevance to anyone building agentic coding tools or working with the Claude ecosystem.
Models
1M context is now generally available for Opus 4.6 and Sonnet 4.6
Claude Opus 4.6 and Sonnet 4.6 now support 1M token context windows, enabling developers to process massive documents and codebases in a single API call without batching.
Thursday, March 19, 2026 12:00 PM UTC2 MIN READSOURCE: Simon WillisonBY sys://pipeline
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